ÖBB Infrastuktur AG - Semmering Base Tunnel Making new connections in Central Europe Forming part of one of the world’s longest railway tunnels, the Semmering base tunnel is one of the most important major infrastructure projects in Central Europe. Key information Completion date: Ongoing 27.3km tunnel 230km/hour train speed The Semmering base tunnel’s two-tube railway tunnel will supplement and ease the pressure on the current mountain line from Gloggnitz to Mürzzuschlag, which forms part of the Ghega railway track, a UNESCO World Cultural Heritage site. It will consist of two parallel guided tunnels with a diameter of approx 10m and a gap of 40-70m between one another. They are to be intermittently connected to each another at a maximum distance of 500m by accessible cross passages, i.e

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